Added Nitrite database under Database category

[anidotnet]

Nitrite is an open source nosql embedded document store written in Java. It has MongoDB like API. It supports both in-memory and single file based persistent store powered by MVStore engine of h2 database.

Nitrite is a server-less embedded database ideal for desktop, mobile or small web applications.

It features:

• Embedded key-value/document and object store
• In-memory or single data file
• Very fast and lightweight MongoDB like API
• Indexing
• Full text search capability
• Full Android compatibility
• Observable store
• Both way replication via Nitrite DataGate server